Looper mechanism for leather-sewing machines.



0. L. LAWSON &1. H. REED.

LOOPER MECHANISM FOR LEATHER SEWING MACHINES.

APPLICATION FILED MAR. 27 1915.

Patented Jan. 1,1918.

INVENTEHSI 65a. X (41.1%

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OSCAR L. LAWSON AND JAMES H. REED, F LYNN, MASSACHUSETTS.

100m MECHANISM FOR LEATHEB FSEWING I :ZO all whom it may concern:

Be it known that we, OSCAR L. LAWSON, ;a subject of the King of Sweden,and .JAMES H. REED, a citizen of the United States, residing at Lynn,county of Essex, State of Massachusetts, have invented a certain new anduseful Improvement in ments in shoe sewing machines of the type shown inPatent No. 1,194,512 to Oscar L. Lawson, dated Aug. 15, 1916', andrelates particularly to the mechanism by means of which the under threadis placed in the book of the needle before it is drawn up through thework to form the loop through which the shuttle thread is passed.

The present invention provides means for placing the thread in theneedle accurately even when the machine is run at very high speed. Thisis accomplished by means of a looper having an eye therein, and a hookcooperating therewith. The parts have such movement relatively to eachother and to .the needle that the back of the hook does not strikeagainst the thread as it comes into position ready to perform its workand therefore has no tendency to displacethe thread or fray or break it.The mechanism by which this is accomplished is very simple. Theinvention will be fully understood by reference to the followingdescription taken in connection with the accompanying drawings and thenovel features thereof will be pointed out and clearly defined in theclaims at the close of the specification. Referrin to the drawings,Figure 1 is a side elevation. of stitch forming instrumentalitiesembodying our invention.

Fig. 2 is a front elevation of the looper,

"hook and needle, showing the formation of the horizontal line of threadwhich is placed in the hook of the needle.

Fig. 3 is a front elevation showing the position of the looper and hookjust before the hook contacts with the thread.

Fig. 4 is a side elevation showing the parts in the same position as inFig. 2.

Fig. 5 shows the parts in the position 00- cupied by the looper afterithas been oscillated to place the thread in the hook ofthe ne d ej.

Specification of Letters Patent.

. Application filed March 27, 1915. Serial No. 17,530.

Patented Jan. 1, 1918.

i 6 is a plan view of theseparts show- I F ing t em in the same positionas in Fig. 5.

ig. 7 is a detail of the connection between the end .of the fork 38 andthe looper shaft 18.

In the drawings, and particularly-in Fig. 1 there is shown at 11 theshuttle, at 12 the hook needle, at 13 the presser foot and at 14 thework support, and at 15 the awl,

these parts being in general the same as those shown in said patent.

The under thread is placed in the hook of the needle 12 after it haspassed 'down through the work by the cooperation of a looper 16 havingan eye or thread guidin portion therein through which the three passes,and a. hook 17. The looper 16 comprises a shaft 18 bent near the top atright angles. The looper shaft 18- is slidable in two lugs 19 and 20 inor secured to a fixed part A of the machine. This upward slidingmovement of the looper and hook is for the purpose of getting thesemembers out of the path of the awl 15 when not employed in placing thethread in the hook of the needle 12 and also to bring them and the underthread into position to lay the thread in the hook of the needle. Whilethis movement is in an inclined plane, it is conveniently referred to asan upward movement because its main object is to move the said parts toand away from the underside of the work support.

The upward movement of the looper and hook is produced by rotation ofthe cam 21 mounted on the cam shaft 22, said cam having a cam groove 23in its face. In this cam groove is a follower 24 mounted on cam lever 25pivoted at 26 to the frame of the machine. To the lower end of thelooper shaft 18 is secured a block 27 having two projections 28 and'29(see Fig. 2) between which is a space of suitable shape to engage a diskor ball 30 formed on the end of the cam lever 25. The looper shaft 18 isfree to rotate in the block 27 but is adapted to be moved vertically byit by means of a plate 31 engaging a circular groove 32 in the loopershaft. It will therefore be seen that although the looper is free to berotated about its longitudinal axis it is given a lon 'tudinalreciprocation by the rotation of t e cam 21. r 4

The hook 17 is pivotedat 33 to the block 27carriedbythel00pershaft.Alinkiie which is pivoted at one end at 35 to the frame A of the machineis pivoted at its other end atv 36 to the hook 17. It will therefore beseen that as the looper 16 is slid longitudinally by the rotation of thecam 21 the link 34 will swing the point or tip of the hook toward oraway from the eye or thread guiding portion of the loo er in apractically horizontal line. This wi clearly be seen from an examinationof Fig. 2 where;

guiding orward in an are formed about the axis of the looper shaft as acenter, the eye or thread guiding portion of the looper being offset andat a distance from the longitudinal axis of the looper. The path ofmovement of the eye of the looper is shown by a dot and dash line inFig.6. This oscillation of the looper is accomplished in the followingmanner In the cam 21- is formed a cam groove 36 in which is located acam follower 37 mounted on a fork 38 which spans the shaft 22. The forkis therefore reciprocated in a horizontal plane by the rotation of thecam. The end of the fork 38 is secured to a member 39. (See particularlyFigs. 2 and 7.) Said member 39 is pivotally connected by a pin 40 to ablock 41 in which the looper shaft 18 is slidably mounted. Beneath theblock 41 .is a projection or lug 43 by which the block is supported andprevented from sliding lengthwise of the looper shaft.

The block 41 and the looper shaft 18 are connected by means of a featherand groove 42, so that while the loo er shaft is slidable vertically itwill be osci lated by the in and out movement of the fork 38.

The operation of the device is as follows The needle 12 passes throughthe hole in the work formed by the awl. About this time, the looper andhook are in the position shown'in Figs. 1.and'3. The hook and looperthen rise, the hook being moved laterally to the position shown in Fig.2as it rises, forming a horizontal portion a of the thread. Thereafterthe looper is oscillated about its vertical axis to the position shownin Fig. 6 by the cam groove 36, and connecting members. This movementcarries the thread forward and lays it in the hook of the needle. Theneedle then rises carrying the thread with it through the work and thehook, and looper descend out'of the path ofthe awl.

What we claim is:

1. A looper mechanism for ahook needle sewing machine comprising alooper and hook movable longitudinally toward the position of'the needleand pivoted together, and a link connected at one end to one of saidmembersand at the other to a fixed part of the machine and adapted tocause the longitudinalmovement of said members to move the point of oneof said members relatively to the other in a direction transverse to theline of movement of said members toward the needle.

2. A looper mechanism for a hook needle sewing machine comprising alooper and hook slidable longitudinally toward the position of theneedle, one of said members having a thread guiding portion offset fromthe longitudinal axis of the member, means for moving onerof saidmembers laterally of the line of movement of said members toward theneedle, and means for moving the offset member about its longitudinalaxis in an arcuate path to lay the thread in the hook of the needle.

3. A looper mechanism for a hook needle sewing machine comprising alooper and hook pivoted together and movable longitudinally toward theposition of the needle, means for moving one of said members laterallyof the line of movement of said members toward the needle whereby thethread is pulled out to form a transverse portion which is adapted to belaid in the hook of the needle, one of said members having 'a' threadguiding portion offset from the longitudinal axis of the member, andmeans for moving the offset member about its longitudinal axis in anarcuate path after the thread is drawn out to lay the thread in the hookof the needle.

In testimony whereof we aflix our signatures, in presence of twowitnesses.

GEORGE P. Dme, Amos H. MORRISON.-

